Hair trimmer



FIG. 1 is a top perspective view of the present hair trimmer;

FIG. 2 is a front view of the same;

FIG. 3 is a right side view of the same;

FIG. 4 is a rear view of the same;

FIG. 5 is a top view of the same; and,

FIG. 6 is a bottom view of the same.

The broken lines are shown for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a hair trimmer, as shown and described. 